Screw jack



Feb. 23 1926;

F. H. WILDER SCREW JACK Origiaal F ild Sept. 25, 1

BY AO W m;

ATTORNEY Patented Feb. 23, 1 926.

UNITED stares "r ,erjs.

FRED HORACE WILDER, F BRATTLEBORO, VERMONT, ASSIGNOR TO MILLERS FALLS COMPANY, OF MILLERS FALLS, MASSACHUSETTS, A CORPORATION OF .MASSA- CHUSETTS.

scnnw JACK.

Application filed September 25, 1923, Serial 1%. 664,723. Itenewed Jari-uary 1s, 1.926. I

To all whom it may concern:

Be it known that I, FRED HORACE WILDER, a citizen of the United States, residing at Brattleboro, in the county of Windham and State of Vermont, have invented certain new and useful Improvements in Screw Jacks, of which the following is a full, clear,

and exact description, such as will enable others skilled in the artto which it appertains to make and use the same.

This invention relates to a jack and aims 0 provide an improved device of this character.

It is an object of thepresent invention to produce a jack which may be used for any ies recl purpose, and which will embrace a simple form. of mechanism, thus furnishing an extremely rugged type of tool, in

which mechanical difficulties will be reduced 0 "o a minimum, aside fromthe fact that the .001 lends itself to being manufactured at a nominal figure. v

It is a further object of the invention to provide an article of the character stated, which may be operated to exert a pushing or ifting action, this operation being extremely simple and capable of accomplishment by any novice with a minimum of exertion.

A still further object of the invention is that of furnishing a tool embracinga construction serving to prevent to the greatest extent the entrance of foreign particles into the mechanism thereof. I

Another object is thatof constructing a jack in which those parts which are subjected to the greatest amount of wear may readily be renewed when it is found that the efliciency of the tool is impaired by this wear.

Other objects of the invention will in part be obvious and will in part appear hereinafter.

The invention accordingly comprises the features of construction combination of elements, and arrangement of parts, which will be exemplifiedin the construction hereinafter set forth and the scope of the appli cation of which will be indicated in the claims.

For a fuller understanding of the nature 59 and objectsof theinvention reference should he had to the following detailed description taken in connection with the accompanying drawing, in which: i Fig. 1 is a front elevation oft-he improved jack with certain of the parts in section,

Fig. 2 is a fragmentary sectional view of a detail of construction, this view being taken at right angles to Fig. 1, and

Fig. 3 is a top plan view of one of the units forming a part of the jack mechanism. Attention being particularly invited to Fig. 1, it will be seen that reference numeral 5 indicates the standard of thejack and that the pushing element thereof may embrace a, contact portion or cap 6 afixed to the upper end of a spindle 7, which latter extends into the standard.

Now with a view to providing means serving to move the spindle longitudinally of the standard, it will be noted that the former may be provided with screw-threads 8 which are engaged by corresponding threads formed on a nut 9. Thus the nut serves to support the spindle and it will be obvious, assuming that these parts are rotated with respect to each other, that the'movement desired will be accomplished. turn, to properly support the nut upon the standard, the adjacent edges of these members may each be formed with an annular groove within each of which there is disposed a removable liner 10, providing a ball race section, it being obvious that when suitable bearing balls 11 are arranged within the ball-race, the spindle operating means will be capable of being. readilymoved with respect to the standard. i

Operating means for the spindle moving means aforedescribed, may be furnished in that a housing 12 is provided which rrotatively encircles the nut as well as a portion of the standard, and this housing may be formed with an extension13 presenting an opening 14 for a purpose hereinafter specified. In the present instance a pawl and ratchet mechanism is incorporated in the housing 12 and nut 9, in-that a ratchet is associated with the nut by forming the same with an annular series of radially ex tended teeth 15, while a pawl is carried by the housing. This pawl may includ'e a body.

In order, in

- the nut.

Thus, assuming that a suitable rod or tool handle is introduced into the opening 14 of the housing 12, and the latter is oscillated with respect to the standard, it will 'be obvious, further assuming that the spindle is restrained against rotation, that rotation of the housmg 1n one direction will cause ahrm engagement between one-of the faces of'the pawl 16 and one of the teeth 15 of the nut 9, to thus rotate the latter, while return "movement of the housing will cause the pawl merely to override these teeth so that a lost motion will result. Due to this movement of the parts, i.e.,- an intermittent rotation of the nut 9, the spindle and contact portions carried thereby will be moved longitudinally of the standard in one direction. 7 Conversely, if it is desired to move the parts in an opposite direction, it will be apparent that this may be accomplished by simply exerting a pull upon the stem 18 by m'eansof a knob 21, so that the stem is retracted to a point at which a pin 22 carried thereby rides be yond the edges of a slot 23 formed in the extension 19. hen the parts have reached thisp'osition, it will be obviousthatthe stem 18 may be turned by means of the knob 21 so that the pawl assumes a position in which the bevelled face 17 thereof extends 'in a direction opposite that in which'it' originally extended, after which the knob 21 may be released in order to permit the pin 22 to again ride into the slot 23 thus locking the parts.

An oscillation of the housing 12 in the manner already described will now cause lost motion between the pawl and ratchet mechanism by that stroke, during which previously the pawl positively engaged the ratchet while movement in the opposite direction will cause lost motion between the'pawl and ratchet. I Still assuming that the spindle is held against rotation, it will be obvious that this member will now be moved longitudinal'ly of the standard in a direction opposite to that which it originally followed, thus again achieving the results desired.

In order to prevent any accidental disar-' rangement of the parts, it wlll be seen as in Figs. 1 and 2, that the housing may be formed with an annular groove 24 in its inner face, while the standard '5 is formed with a corresponding groove 25 in its outer face, and at a point in line with the first named groove. A lock ring 26 may be disposed so as to extend partially within'each of the grooves 24 and 25 as brought out in Fig. 1

andthus it will be evident that any material movement of the parts, other than in the proper manner, is prevented. When it is desired the detachment of these parts may .76 readily accomplished by simply introducing a suitable implement through the opening in the standard which communicates with the recess or. groove 25. Thus the ring may be displaced 'so. that apartial detachment may be effected, subsequently to which the parts may be manipulated to entirely displace the operating member from the standard. Further, in order to prevent any improper movement of the nut 9 with respect to the parts with which it is associated, it will be-seen that the upper edge of the hous i'ng 12 may be intu'rned to provide a flange 2?,and this flange may engage a shoulder 28 formed for this purpose in the upper edge of the nut. Thus, in addition to the housing providing an operating means forthe spindle movingmechanism, it will be noted that this element also serves as a restraining memher to prevent any disarrangement of the parts with respect to each other.

Finally, in order to prevent the entrance of particles of foreign matter into the jack, although permittmgacc'ess to be had to the interior of the standard, it will be noted that the latter may be formed with an openmg 29 in its base, which opening is reduced to provide a shoulder againstfwh-ich a closure plate 30. may bear, the plate being normally;

held in position by means 'ofa l0ck'ring31in engagement with both this member and the side walls of .the-openmg 29. In the event that the plate 30 is removed, it will'be obvious that the inner end of the spindle 7 may he reached so that if it is desired to completely remove the latter from the tool, this maybe accomplished simply by withdrawing the stop pin 32 which normally serves, by contacting with a portion of the inner face of the standard to prevent undue movement of the spindle in an outward direction.

In use it will be appreciated that according to the construction exemplified, the spindle 7 'is normally held against rotation by the load upon the contact portion thereof, and this load may be moved by simply reversing the pawl in the manner aforcdescribed to cause the sameto'assume a position opposite to that shown 1n Fig. 1, so that by oscillating the housing the spindle moving means embraced by the nut 9 is intermittently rotated. hen it is desired to return the parts'to their normal position, a continued oscillatio'nafter the pawl has been again brought into the position shown in Fig. 1, will. obviously eifect this result, it

being noted, due to the aggregate lei'igth of the standard and housing that the spindle will be enclosed substantially in its entirety within the b'ody ofthe jack when it is disposed in its normal or retracted position, it

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being thus understood that a minimum or space is normally occupied by the jack. Incident to the manner in which all of the parts are enclosed, the entrance of foreign matter into the mechanism of the tool is prevented to a great extent and if the bearing provided by the ball race wears, it will be seen that this defect may readily beovercome by simply removing the liners 10 and substituting therefor new liners.

Since certain changes maybe made in the above construction and different embodiments of the invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted asillustrative and not in a limiting sense,

It is also to be understood that the following claims are intended to cover all of therebetween.

Having described my invention, what I claim as new and desire to secure by Letters l-atent, is: v

1. A jack, including a standard, a spindle carried by said standard, spindle moving means forming a part of said jack and cooperating with said standard, operating means for said moving means, said operat-. ing means being movable with respect to said standard, said standard and operating means being formed with complementary grooves and means extending into both of said grooves for preventing accidental removal of said operating means from said jack.

2. A jack, including a standard, a spindle carried by said standard, spindle moving means forming a part of said jack and cooperating with said standard, operating means for said movingmeans, said operating means be ng movable with respect to said standard and a releasable locking r ng cooperating with said operating means and standard to normally retain all of said parts in properly correlated position.

3. A jack, including a standard, a spindle. carried by said. standard, spindle moving means forming a part of said jack and coop grooves and a lock ring extending into both of said grooves for normally retaining all ot said parts in properly correlated positions. i V

4. A jack, including in combination, a

standard and operating standard, a nut mounted to rotate on the upper end of the standard, a spindle threaded through the nut, a housing for the nut rotatably connected with the upper end of the standard, a pawl and ratchet connection between the nut and the housing, the rotatalile connection between the housing and the standard including annular grooves in the adjacent faces of the housing and the standard, and a locking ring engaging the grooves.

5. A ack, including a standard, a spindle carried by said standard, means for causing a movement of said spindle relatively to said standard, said means and standard being formed with complementary recesses, one of said elements being formed with an opening affording access to the chamber provided by said recesses, and means common to both of said recesses for preventing an accidental detachment of the parts of said jack, said opening affording access to said last-named means. i

6. A jack, including, in combination, a standard, a lifting member and operating means therefor carried by said standard, said standard and operating means being formed with complementary recesses, and means common to both of said recesses for preventing a displacement of said parts.

7. A jack, including a standard, a spindle carried by said standard, means for causing relative movement of said parts, said means and standard being formed with complementary recesses, and one of-said elements being formed with an opening attordingaccoss to the chamber provided by said. recesses, and a ring disposed within said chamtor for preventing a relative displacement of the recessed parts. 1 In testimony whereot I atfix my signature.

rei n nonaon Wrrnna 

